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Preprints, Working Papers, ... Year : 2017

Long-lived non-thermal states realized by atom losses in one-dimensional quasi-condensates

Abstract

We investigate the cooling produced by a loss process non selective in energy on a one-dimensional (1D) Bose gas with repulsive contact interactions in the quasi-condensate regime. By performing nonlinear classical field calculations for a homogeneous system, we show that the gas reaches a non-thermal state where different modes have acquired different temperatures. After losses have been turned off, this state is robust with respect to the nonlinear dynamics, described by the Gross-Pitaevskii equation. We argue that the integrability of the Gross-Pitaevskii equation is linked to the existence of such long-lived non-thermal states, and illustrate this by showing that such states are not supported within a non-integrable model of two coupled 1D gases of different masses. We go beyond a classical field analysis, taking into account the quantum noise introduced by the discreteness of losses, and show that the non-thermal state is still produced and its non-thermal character is even enhanced. Finally, we extend the discussion to gases trapped in a harmonic potential and present experimental observations of a long-lived non-thermal state within a trapped 1D quasi-condensate following an atom loss process.
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Dates and versions

hal-01479415 , version 1 (28-02-2017)
hal-01479415 , version 2 (03-03-2017)
hal-01479415 , version 3 (17-03-2017)

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A. Johnson, S. S. Szigeti, M. Schemmer, Isabelle Bouchoule. Long-lived non-thermal states realized by atom losses in one-dimensional quasi-condensates. 2017. ⟨hal-01479415v2⟩
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